US4972042A - Blocking arrangement for suppressing fluid transmission in cables - Google Patents

Blocking arrangement for suppressing fluid transmission in cables Download PDF

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Publication number
US4972042A
US4972042A US07/159,039 US15903988A US4972042A US 4972042 A US4972042 A US 4972042A US 15903988 A US15903988 A US 15903988A US 4972042 A US4972042 A US 4972042A
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US
United States
Prior art keywords
array
wires
cable
covering
blocking
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
US07/159,039
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English (en)
Inventor
Judith L. Seabourne
Alistair F. Hill
Paul A. Bradley
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Tyco Electronics UK Ltd
Original Assignee
Raychem Ltd
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
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Assigned to RAYCHEM LIMITED, A COMPANY OF UNITED KINGDOM reassignment RAYCHEM LIMITED, A COMPANY OF UNITED KINGDOM ASSIGNMENT OF ASSIGNORS INTEREST. Assignors: BRADLEY, PAUL A., HILL, ALISTAIR F., SEABOURNE, JUDITH L.
Application granted granted Critical
Publication of US4972042A publication Critical patent/US4972042A/en
Assigned to TYCO ELECTRONICS UK LTD. reassignment TYCO ELECTRONICS UK LTD. ASSIGNMENT OF ASSIGNORS INTEREST (SEE DOCUMENT FOR DETAILS). Assignors: RAYCHEM LIMITED
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01B—CABLES; CONDUCTORS; INSULATORS; SELECTION OF MATERIALS FOR THEIR CONDUCTIVE, INSULATING OR DIELECTRIC PROPERTIES
    • H01B7/00—Insulated conductors or cables characterised by their form
    • H01B7/0045—Cable-harnesses
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4401—Optical cables
    • G02B6/4415—Cables for special applications
    • G02B6/4427—Pressure resistant cables, e.g. undersea cables
    • G02B6/4428—Penetrator systems in pressure-resistant devices
    • G—PHYSICS
    • G02—OPTICS
    • G02B—OPTICAL ELEMENTS, SYSTEMS OR APPARATUS
    • G02B6/00—Light guides; Structural details of arrangements comprising light guides and other optical elements, e.g. couplings
    • G02B6/44—Mechanical structures for providing tensile strength and external protection for fibres, e.g. optical transmission cables
    • G02B6/4439—Auxiliary devices
    • G02B6/4471—Terminating devices ; Cable clamps
    • G02B6/4476—Terminating devices ; Cable clamps with heat-shrinkable elements
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01R—ELECTRICALLY-CONDUCTIVE CONNECTIONS; STRUCTURAL ASSOCIATIONS OF A PLURALITY OF MUTUALLY-INSULATED ELECTRICAL CONNECTING ELEMENTS; COUPLING DEVICES; CURRENT COLLECTORS
    • H01R4/00—Electrically-conductive connections between two or more conductive members in direct contact, i.e. touching one another; Means for effecting or maintaining such contact; Electrically-conductive connections having two or more spaced connecting locations for conductors and using contact members penetrating insulation
    • H01R4/70—Insulation of connections
    • H01R4/72—Insulation of connections using a heat shrinking insulating sleeve
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S174/00—Electricity: conductors and insulators
    • Y10S174/08—Shrinkable tubes

Definitions

  • This invention relates to blocking cables, that is to say, to the provision of a quantity of sealant in a cable in order to prevent the transmission of fluids along the cable.
  • Such cables include electrical cables and harnesses, optical fibre cables and hybrid cables and harnesses that contain both electrical wires and optical fibres (the term "wire” used herein including optical fibres and the term “cable” including harnesses).
  • a heat-shrinkable sleeve provided with a thick layer of hot-melt adhesive may be used to provide a block for cables having a small number of wires, for example up to 2 wires, but in the case of larger cables having three or more wires the wires are often pushed together during recovery of the sleeve and act as a barrier to prevent the adhesive flowing into the central interstice or interstices in the cable.
  • the wires are often pushed together during recovery of the sleeve and act as a barrier to prevent the adhesive flowing into the central interstice or interstices in the cable.
  • a generally flat blocking array for forming a block in a cable against transmission of fluid along the cable, the array having a plurality of passageways extending from one end thereof to the other end thereof for receiving wires and each passageway being capable of receiving one or more wires by insertion of the wires from the side of the passageway, the array being formed from a hot-melt or thermosetting adhesive that has a melting point of not more than 120° C.
  • a cable or harness may be blocked in a simple manner according to the invention by:
  • the passageways are preferably capable of receiving the wire or wires by insertion of the wire or wires from the side of the passageway.
  • the blocking array according to the invention enables the rapid formation of a fluid block in a cable or harness having three or more wires, especially one having more than 10 wires, for example at least 20 wires, and usually up to about 60 wires. Because the blocking array has a substantially flat configuration, no parts of the array or wires are remote from the surface of the arrangement before recovery of the heatshrinkable covering, with the result that the entire quantity of fusible sealant and all the wire insulation can be heated to the required degree to form an effective seal even though the sealant in the central region of the completed cable block can be a considerable distance from the surface of the cable. It is possible for the blocking array to be arranged so that each individual passageway receives only a single wire or so that it can receive more than one wire.
  • each passageway can receive only a few wires, preferably no more than three wires, since if many more wires are inserted into the same passageway they may prevent the fused array material flowing into the central interstice formed by the wires.
  • Some forms of array are designed so that each passageway can receive no more than two wires.
  • the blocking array may be sold separately from the covering or they may be sold together for example in the form of a kit, and so, according to another aspect, the invention provides an arrangement for forming a block in a cable against transmission of fluid along the cable, which comprises a generally flat blocking array that is formed from a fusible polymeric sealant, the array having a plurality of passageways extending from one end thereof to the other end thereof for receiving one or more wires of the cable and the assembly including a heat-shrinkable covering that can be positioned around the blocking array in its flat configuration and recovered about the array by application of heat, the sealant being capable of melting during recovery of the covering and being forced from a substantially flat configuration into a generally cylindrical configuration by recovery of the covering.
  • the blocking array according to the invention preferably has at least 5, more preferably at least 10 passageways and usually up to 30 passageways extending through it.
  • the blocking array will have a configuration such that all the passageways are arranged in a single flat array.
  • This configuration has the advantage that it is possible for all the passageways to be capable of receiving one or more wires by insertion of the wires from the same side of the array.
  • This enables the blocking array to be temporarily located on a wiring board in the manufacture of a cable harness, and then removed from the board only when all the wires have been inserted. For this reason it may be advantageous to provide the blocking array with a quantity of pressure sensitive or other adhesive on the side of the array opposite to the side from which the wires can be inserted.
  • the passageways may be arranged in a pair of flat arrays so that the wires are inserted from either or both sides of the array.
  • the blocking array may be used as a wire organiser, for example as described in British patent specification No. 2,038,110A, the disclosure of which is incorporated herein by reference.
  • the array may be slid or "combed" along the wires in order to organise them into the correct order.
  • two or more such arrays may be joined together with the passageways in each array being axially aligned to form an array of connected passageways. In this embodiment one or more arrays may be detached at different positions along the harness or cable.
  • the choice of fusible polymeric sealant that is used to form the blocking array will depend on a number of factors including the intended maximum operating temperature of the cable block.
  • the sealant has a melting or softening point of at least 50° C. and especially at least 60° C., but usually not more than 120° C. and preferably not more than 100° C.
  • the minimum acceptable softening point is usually determined by the maximum operating temperature of that part of the cable, while the maximum acceptable softening point is normally set by the type of insulation that the wires contain.
  • the sealant is preferably a hot-melt adhesive or a thermosetting material such as epoxy resin/curing agent mixes may be used although other materials such as thermoplastic elastomers may be used.
  • the blocking array may be formed as a co-extrusion of an epoxy (or other thermosetting resin) and a curing agent where the epoxy and curing agent are in the form of stripes.
  • articles formed in this manner are described in European patent specification No. 117,738, the disclosure of which is incorporated herein by reference.
  • materials that may be used to form the blocking array include olefin homo- and copolymers, e.g. low density polyethylene, ethylene vinyl acetate or ethylene acrylate copolymers, ionomers, e.g. those sold under the trade mark "Surlyn" and polyamides, especially dimer diamine polyamides. Examples of preferred materials are given in U.S. Pat. Nos. 4,018,733 to Lopez et al and 4,181,775 to Corke, the disclosures of which are incorporated herein by reference.
  • the heat-shrinkable covering used in the present invention is preferably in the form of a sleeve and may be made from a polymeric material exhibiting the property of elastic or plastic memory as described, for example, in U.S. Pat. Nos. 2,027,962; 3,086,242 and 3,597,372.
  • the original dimensionally heat-stable form may be a transient form in a continuous process in which, for example ⁇ an extruded tube is expanded, whilst hot, to a dimensionally heat-unstable form but, in other applications, a preformed dimensionally heat stable article is deformed to a dimensionally heat unstable form in a separate stage.
  • the polymeric material may be cross-linked at any stage in the production of the article that will enhance the desired dimensional recoverability.
  • One manner of producing a heat-recoverable article comprises shaping the polymeric material into the desired heat-stable form, subsequently cross-linking the polymeric material, heating the article to a temperature above the crystalline point or, for amorphous materials the softening point, as the case may be, of the polymer, deforming the article and cooling the article whilst in the deformed state so that the deformed state of the article is heat-unstable, application of heat will cause the article to assume its original heat-stable shape.
  • the sleeve may be formed from a fabric, preferably a woven fabric, that employs heatshrinkable fibres and preferably also a polymer matrix, for example as described in European patent specification No. 116,393, the disclosure of which is incorporated herein by reference.
  • the heat-shrinkable sleeve is required to force the blocking array from a flat configuration into a cylindrical configuration as well as exerting a radially compressive force on the fused array material, the sleeve should be able to accommodate a relatively large change in dimensions. Accordingly it is preferred to use a sleeve or other covering that has a relatively large recovery ratio, preferably at least 3:1 and especially at least 4:1, and which fits the array in its flat configuration reasonably snugly (without, of course, being so tight a fit that it is difficult to slide the sleeve over the array). In view of this, it may be appropriate in some instances for the heat-shrinkable covering to be in the form of a tape that can be wrapped around the blocking array and installed wires. In yet another arrangement the cover may be in the form of a slit sleeve that is provided with a closure device to enable the sleeve to be positioned around the array after installation of the wires and closed about the array and wires.
  • Any polymeric material which can be cross-linked and to which the property of dimensional recoverability may be imparted such as those disclosed in U.K. Specification No. 990,235 may be used to form the heat-shrinkable covering.
  • Polymers which may be used as the polymeric material include polyolefins such as polyethylene and polypropylene, and ethylene copolymers, for example with propylene, butene, hexene, octene, vinyl acetate or other vinyl esters or methyl or ethyl acrylate, polyamides, polyurethanes, polyvinyl chloride, polyvinylidine fluoride, or other fluorinated polymers or copolymers, e.g.
  • Tefzel (trade name--commercially available from Dupont), elastomeric materials such as those disclosed in U.K. Specification No. 1,010,064 and blends such as those disclosed in U.K. Specifications Nos. 1,284,082 and 1,294,665, and compositions such as those disclosed in our U.S. Pat. No. 4,275,180.
  • the polymeric materials can be tailored to suit the intended use by the addition of fillers, e.g. semiconducting fillers or anti-tracking agents, flame retardants, plasticisers, pigments, stabilisers and lubricants, or where necessary, e.g. where the polymeric material is substantially non-crystalline, a hold-out agent such as a thermoplastic polymer, e.g. polyethylene, may be included in the material.
  • the polymeric composition may be cross-linked either by the incorporation of a chemical crosslinking agent or by exposure to high energy radiation.
  • suitable crosslinking agents are free radical initiators such as peroxides for example, dicumyl peroxide, 2,5-bis-(t-butyl peroxy)-2,5-dimethylhexane, 2,5-bis(t-butyl-peroxy)-2,5-dimethylhexyne-3, ⁇ , ⁇ -bis-(t-butyl-peroxy)-di-iso propylbenzene.
  • suitable cross-linking agents are disclosed in C. S. Sheppard & V. R. Kamath Polymer Engineering & Science 19 No.
  • a typical chemically cross-linked composition there will be about 0.5 to 5 weight per cent of peroxide based on the weight of the polymeric composition.
  • the cross-linking agent may be employed alone or in association with a co-curing agent such as a polyfunctional vinyl or allyl compound, e.g. triallyl cyanurate, triallyl isocyanurate or pentaerythritol tetramethacrylate.
  • Radiation cross-linking may be effected by exposure to high energy irradiation such as an electron beam or gamma rays. Radiation dosages in the range 2 to 80 Mrads, preferably 2 to 50 Mrads, e.g. 2 to 20 Mrads and particularly 4 to 15 Mrads are in general appropriate.
  • a prorad such as a poly-functional vinyl or allyl compound
  • a prorad such as a poly-functional vinyl or allyl compound
  • triallyl cyanurate, triallyl isocyanurate or pentaerythritol tetramethacrylate are incorporated into the composition prior to irradiation.
  • FIG. 1 is an isometric view of a cable blocking array according to the invention
  • FIG. 2 is a schematic view of a harness during its manufacture
  • FIG. 3 is a section through a completed cable block that has been formed according to the invention.
  • FIG. 4 is a section through an alternative design of blocking array
  • FIG. 5 is a section through yet another design of blocking array.
  • a cable blocking array comprises a generally flat body 1 having ten open-ended passageways 2 extending through it.
  • Each passageway 2 has associated with it a slot 3 which enables an electrical wire to be inserted into the passageway simply by positioning the wire along the slot and pressing the wire into the passageway. It is possible for any number of wires to be inserted into each passageway, depending on the relative dimensions of the wires and passageways, although it is preferred for each passageway to contain about two such wires 4.
  • all the slots 3 are located on the same side of the array so that the opposite side of the array may be provided with a layer (not shown) of pressure sensitive adhesive, and release paper if necessary, for adhering the array onto a wiring board.
  • the blocking array may be made simply by extruding a hot-melt adhesive or other sealant with the appropriate cross-section.
  • the extrusion is preferably conducted using a water-cooled die in tandem with the extrusion die in order to "set" the extrudate into the correct configuration.
  • the slots 3 may be formed by extrusion or may be formed after extrusion using a knife blade.
  • FIG. 2 shows schematically a harness for an automotive vehicle in the course of production.
  • Three blocking arrays 11,12 and 13 have been located at predetermined positions along the harness and temporarily adhered to the harness wiring board by means of the pressure-sensitive adhesive.
  • Wires 14 are then laid up in the general harness layout and can simply be pressed into the slots 3 of the array. The wires are then bound up and, if desired, heat-shrinkable tubing (not shown) is recovered onto the wires to form a harness jacket, followed by the connection of connectors 15 or other harness terminations.
  • Heat-shrinkable coverings either in the form of a sleeve 16 that had previously been positioned on the harness, or in the form of a tape 17, is applied onto the blocking array and also onto the adjacent regions of the wires or cable jackets.
  • the assembly is then heated, preferably by means of a hot-air gun, to form the completed cable block as shown in FIG. 3.
  • the wires 14 are completely encapsulated in fused and resolidified sealant 18, and the wires and sealant are enclosed in the heatshrinkable sleeve 16 or tape 17.
  • the arrangement When applied to an existing cable, the arrangement can be installed with a heating time in the order of two minutes.
  • FIG. 4 shows an alternative form of blocking array according to the invention.
  • the side from which the wires 4 are inserted into the array contains a number of bevelled surfaces 5 adjacent to the slots 3 in order to facilitate correct alignment and insertion of the wires.
  • parts of the internal surface 6 of the passageways adjacent to the slots 3 can be built up so that the walls 7 between the passageways and individual parts of the bevelled upper surface have a generally "arrow-head" profile to retain the wires 4 in the passageways.
  • FIG. 5 is a section through part of another blocking array 1 in which the passageways 2 are each capable of receiving three wires 4.
  • the passageways 2 are deep in relation to their width so that when the wires 4 are inserted into the passageway they all lie in the same plane with a separating wall 7 on either side of each wire. This arrangement enables the sealant from which the array is formed to flow around each of the wires 4 when the assembly is heated without a leak path being formed along the wires.
  • the walls are formed in each of two different lengths so that relatively long walls alternate with relatively short walls. This arrangement enables the enlarged tops 8 of the walls to retain the wires 4 within the passageways 2 without the slots for insertion of the wires into the passageways having to be so narrow that the tops 8 of adjacent walls 7 adhere to each other due to swelling of the sealant as it leaves the extrusion die during manufacture of the array.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Optics & Photonics (AREA)
  • Insulated Conductors (AREA)
  • Cable Accessories (AREA)
  • Communication Cables (AREA)
  • Installation Of Indoor Wiring (AREA)
  • Flexible Shafts (AREA)
  • Glass Compositions (AREA)
  • Materials For Medical Uses (AREA)
  • Control Of Motors That Do Not Use Commutators (AREA)
  • Manufacturing Of Electric Cables (AREA)
US07/159,039 1986-06-12 1987-06-12 Blocking arrangement for suppressing fluid transmission in cables Expired - Lifetime US4972042A (en)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
GB8614369 1986-06-12
GB868614369A GB8614369D0 (en) 1986-06-12 1986-06-12 Blocking arrangement

Publications (1)

Publication Number Publication Date
US4972042A true US4972042A (en) 1990-11-20

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Application Number Title Priority Date Filing Date
US07/159,039 Expired - Lifetime US4972042A (en) 1986-06-12 1987-06-12 Blocking arrangement for suppressing fluid transmission in cables

Country Status (10)

Country Link
US (1) US4972042A (de)
EP (1) EP0249510B1 (de)
JP (1) JP2659382B2 (de)
KR (1) KR950014330B1 (de)
AT (1) ATE66540T1 (de)
BR (1) BR8707346A (de)
CA (1) CA1287134C (de)
DE (1) DE3772268D1 (de)
GB (1) GB8614369D0 (de)
WO (1) WO1987007755A1 (de)

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GB2269708B (en) * 1992-07-07 1996-11-20 Sumitomo Electric Industries Method of producing wiring harnesses
US5672290A (en) * 1995-03-13 1997-09-30 Raychem Corporation Power source and method for induction heating of articles
WO1998037608A1 (en) * 1997-02-25 1998-08-27 Raychem Corporation Arrangement for holding elongate substrates
US5824954A (en) * 1995-07-10 1998-10-20 Raychem Corporation Sealed interconnection device
US5874713A (en) * 1997-07-08 1999-02-23 Raychem Corporation Single turn induction heating coil
US5952071A (en) * 1994-04-12 1999-09-14 N.V. Raychem S.A. Curable adhesive system
US6107574A (en) * 1998-02-24 2000-08-22 Chang; Rong J. Sealing article
US6255634B1 (en) 2000-05-15 2001-07-03 Pillar Industries Transverse flux heating coil and method of use
US6359226B1 (en) 1998-04-21 2002-03-19 Tyco Electronics Corporation Device and method for protecting and sealing exposed wires
US20040184961A1 (en) * 2003-01-30 2004-09-23 Ilya Feygin Apparatus and method for investigating chemical entities
US20050029004A1 (en) * 2004-04-29 2005-02-10 Robinson Paul W. Cable harness breakout and method for its assembly
US6888067B1 (en) * 2002-10-30 2005-05-03 Delaware Capital Formation, Inc. Cable sealing apparatus and method
US20080257580A1 (en) * 2007-04-10 2008-10-23 Takeki Ishimoto Cable harness
US20100032205A1 (en) * 2008-08-08 2010-02-11 Tyco Electronics Corporation High performance cable splice
US20130108220A1 (en) * 2011-10-31 2013-05-02 Marco Antonio Gonzalez Garcia Systems and methods for providing a ferrule boot
US20140311796A1 (en) * 2013-04-17 2014-10-23 Harco Laboratories, Inc. Wire harness for high temperature exhaust gas applications
US20180082765A1 (en) * 2015-03-31 2018-03-22 Autonetworks Technologies, Ltd. Wire harness and wire harness production method
US20180097344A1 (en) * 2016-09-30 2018-04-05 Tyco Electronics Corporation Assembly and Method for Sealing a Bundle of Wires
US10483661B2 (en) 2017-02-07 2019-11-19 Te Connectivity Corporation System and method for sealing electrical terminals
US11257612B2 (en) * 2018-07-26 2022-02-22 TE Connectivity Services Gmbh Assembly and method for sealing a bundle of wires
US11269148B2 (en) * 2020-04-28 2022-03-08 Ii-Vi Delaware, Inc. Organizer for fiber optic components
CN115527712A (zh) * 2022-11-28 2022-12-27 常州捷翼汽车零部件有限公司 一种分层布置的硬质化线束及车辆
US20230056662A1 (en) * 2021-08-20 2023-02-23 Vertiv It Systems, Inc. Wire comb

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GB8800421D0 (en) * 1988-01-08 1988-02-10 Raychem Ltd Arrangement for encapsulating electrical wires
DE4013785A1 (de) * 1990-04-28 1991-10-31 Minnesota Mining & Mfg Verfahren zum abdichten eines kabelbuendels in laengsrichtung und flexibles element zur durchfuehrung des verfahrens
GB2262393B (en) * 1991-11-25 1996-04-10 Sumitomo Wall Systems Ltd A wire harness including a wire spacing device
BR9609086A (pt) * 1995-05-18 1999-02-02 Raychem Ltd Método de bloqueio de um cabo ou um feixe de condutores
CN101752715B (zh) * 2008-12-11 2013-08-14 富士康(昆山)电脑接插件有限公司 线缆连接器
JP7185203B2 (ja) * 2017-12-26 2022-12-07 株式会社Lixil 線材保持具
NO347004B1 (en) 2018-12-13 2023-04-03 Nexans Method for installing an end cap arrangement for sealing off an end portion of a heating cable

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ATE66540T1 (de) 1991-09-15
JP2659382B2 (ja) 1997-09-30
GB8614369D0 (en) 1986-07-16
CA1287134C (en) 1991-07-30
JPS63503494A (ja) 1988-12-15
KR880701442A (ko) 1988-07-27
WO1987007755A1 (en) 1987-12-17
KR950014330B1 (ko) 1995-11-24
BR8707346A (pt) 1988-09-13
DE3772268D1 (de) 1991-09-26
EP0249510A1 (de) 1987-12-16
EP0249510B1 (de) 1991-08-21

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